KR20180037142A - Subassemblies including a compressible pressure pad, a method for reducing ripple effect in a display device, and a method for improving shock absorption in a display device - Google Patents

Abstract

A subassembly for a display device includes a display component including an outer display surface and an opposite inner surface; A compressible pressure pad disposed on the inner surface of the display component and including a plurality of nonwoven fibers having an average diameter of less than 100 micrometers; And an internal component disposed on the compressible pressure pad at an opposite side of the display component. Methods for improving ripple effect and shock absorption in a display device are also described.

Description

Subassemblies including a compressible pressure pad, a method for reducing ripple effect in a display device, and a method for improving shock absorption in a display device

The following embodiments are directed to subassemblies including compressible pressure pads, a method for reducing ripple effects in a display device, and a method for improving shock absorption in a display device.

Advances in electronics have brought thin, flat panel display devices to the trend, including the use of liquid crystal display (LCD) devices. LCD component nuts are generally easily broken. LCDs may be damaged if a certain level of external impact is applied to the display. In addition, devices featuring LCDs and other types of display technologies may experience ripple effects when pressure is applied to the display, for example, in a touch-based LCD device. It is particularly preferred to provide an LCD device exhibiting a reduced ripple effect when pressure is applied to the display. Accordingly, there is a continuing need for a technique for a display device having improved impact characteristics and, in particular, a reduced ripple effect.

A subassembly for a display device includes a display component including an outer display surface and an opposite inner surface; A compressible pressure pad disposed on the inner surface of the display component and comprising a plurality of nonwoven fibers having an average diameter of less than 100 micrometers; And an internal component disposed on the compressible pressure pad of the opposite side of the display component.

A display device including the subassembly described above is also disclosed, wherein the display device is a mobile electronic device.

A subassembly for a mobile electronic display device comprises: a liquid crystal display component or light emitting diode display component having an external display surface and an opposite internal display surface; a screen disposed on the external display surface of the display component; A compressible pressure pad disposed adjacent the interior surface of the display component, the compressible pressure pad having an average diameter of less than 100 micrometers, a thickness of 50 micrometers to 1 millimeter, a weight per gram of 5 to 30 square meters , Comprising a plurality of nonwoven thermoplastic fibers devoid of foam; And an internal component disposed on the compressible pressure pad of the opposite side of the display component.

The mobile electronic display device comprises the sub-assembly, and preferably the mobile electronic device is a cellular telephone, a smart telephone, a laptop computer, or a tablet computer.

A method of reducing ripple effect in a display device comprising a display component disposed on an internal component comprises providing a compressible pressure pad comprising a plurality of nonwoven fibers having an average diameter of less than 100 micrometers, And < / RTI >

A method of improving impact absorption in a display device comprising a display component disposed on an internal component comprises providing a compressible pressure pad comprising a plurality of nonwoven fibers having an average diameter of less than or equal to 100 micrometers, And the inner component, wherein the compressible pressure pad has a thickness of 250 micrometers or less, preferably 150 micrometers or less.

Wherein the nonwoven material comprises a plurality of nonwoven polymeric fibers having an average diameter of less than or equal to 100 micrometers and having a basis weight of less than 250 micrometers and wherein the plurality of nonwoven polymeric fibers have a breaking strength of greater than 100 percent measured in accordance with ASTM D638 Elongation; A resiliency of more than 50%, preferably more than 60%, more preferably more than 65%, measured according to ASTM D4964; And a thermoplastic elastomer having a melt flow index in excess of 5 grams per 10 minutes measured according to ASTM D1238 or ISO 1133, said nonwoven material having an impact force reduction of at least 4%, preferably at least 10% .

The foregoing and other features are exemplified by the following figures and detailed description.

The following figures are exemplary embodiments.
1 is a schematic diagram of an electronic device including a compressible compression pad.
Figure 2 shows the results of an extended compression test.
Figure 3 shows the results of a ball drop impact test using a 4.3 gram steel ball dropped from a height of 30.5 centimeters.
Figure 4 shows the results of a ball drop impact test using a 10 gram steel ball dropped from a height of 10 centimeters above various materials disposed on a glass layer.
Figure 5 shows the results of a ball drop impact test using a 30.6 gram steel ball dropped from a height of 20 centimeters above various materials disposed on a glass layer.
Figure 6 shows the results of a drop impact test using a 55 gram steel ball dropped from a height of 20 centimeters above various materials disposed on a glass layer.

Described herein is a compressible pressure pad used in a subassembly of a display device. Advantageously, the compressible pressure pads are commonly used in mobile electronic devices, typically when pressure is applied to a display, for example a liquid crystal display (LCD) or a light emitting diode (LED) The observed ripple effect can be reduced or eliminated. In another advantageous feature, the inventors of the present disclosure have unexpectedly discovered that a fibrous nonwoven mat can be used to mitigate the ripple effect typically observed when pressure is applied to a display device in a display device, It can be used as a shock absorbing layer to reinforce the screen of the device. The use of a foam-free nonwoven mat preferably provides a high-performance, cost-effective solution for reinforcing the screen of a display device.

Thus, one aspect of the disclosure is a display device subassembly 10 generally shown in FIG. The display device subassembly 10 is preferably an LCD. However, it is understood that the pad may be used in other display devices where the pressure pad is useful. The subassembly 10 includes a display component 12 - or a display package known in the art. The display component 12 has an outer display surface 12 and an opposing inner surface 16. The screen 18 may be disposed on the outer surface 14. As used herein, "disposed" means that the two components can be in direct contact, or one or more intervening layers can be present. For example, an optically clear adhesive layer (not shown) may be present between the external display surface 14 and the screen 18.

A compressible pressure pad (20) is disposed on the inner surface (16). The compressible pressure pad includes an inner surface 16 and an internal component 22 of the display device such as a battery, a heat sink, an electronic component, a display housing housing, or the like. In some embodiments, the compressible pressure pad 20 may be disposed between the inner surface 16 of the display component 12 and the inner component 22 of the display component 12 by one or more adhesive layers, e.g., One or both. In some embodiments, the apparatus does not include an adhesive layer disposed on a compressible pressure pad. A compressible pressure pad has a resilience to return to its original thickness when the pressure is released, and has a good hysteresis for its elasticity.

The compressible pressure pad 20 also comprises a plurality of nonwoven fibers having an average diameter of less than 100 micrometers and is therefore porous so that a continuous void extending throughout the thickness of the pad, . The nonwoven fibers may have an average diameter of less than 100 micrometers, for example, 0.5 nanometer to 100 micrometers, or 0.5 nanometers to 80 micrometers, or 1 nanometer to 50 micrometers; Or 0.5 nanometers to 10 micrometers, or 10 nanometers to 8 micrometers, or 100 nanometers to 5 micrometers; Or from 250 nanometers to 5 micrometers, or from 500 nanometers to 5 micrometers, or from 750 nanometers to 5 micrometers, or from 1 micrometer to 5 micrometers. In some embodiments, the nonwoven fibers preferably have an average diameter of less than or equal to 5 micrometers. In some embodiments, the nonwoven fibers are microfibers having an average diameter of 1 to 10 micrometers, or 1 to 5 micrometers. In some embodiments, the nonwoven fibers may have a diameter of from 0.5 to 900 nanometers, or from 10 to 800 nanometers, or from 200 to 700 nanometers, or from 1 to 100 nanometers, or from 1 to 50 nanometers, or from 10 to 50 nanometers They are nanofibers with an average diameter.

Nonwoven fabrics include, but are not limited to, circular, oval, square, rectangular, triangular, diamond, trapezoidal and polygonal. And may have cross-sections of various regular and irregular shapes. The number of faces of the polygonal section may vary from 3 to 16. In some embodiments, the fibers preferably have a circular or substantially circular cross-section.

The nonwoven fabrics may be in the form of a fibrous mat comprising a plurality of nonwoven fabrics. The compressible pressure pad may have an average pore (voide) diameter of between 0.05 nanometers and 50 millimeters, or 0.1 nanometers to 1 millimeter, or between 1 nanometer and 500 micrometers of fibers . In some embodiments, pores and spaces may have an average diameter of 0.05 to 900 nanometers, or 0.1 to 800 nanometers, or 1 to 800 nanometers, or 10 to 700 nanometers, or 200 to 700 nanometers. have. In some embodiments, pores or spaces may be from 1 micrometer to 50 millimeters, or from 5 micrometers to 1000 micrometers, or from 10 to 800 micrometers, or from 10 to 500 micrometers, or from 100 to 900 micrometers, or 200 Lt; RTI ID = 0.0 > 700 < / RTI >

The compressible pressure pad may be in the range of 10 micrometers to 10 millimeters, or 50 micrometers to 5 millimeters, or 50 micrometers to 2 millimeters, or 50 micrometers to 1 millimeter, or 50 to 500 micrometers, or 50 to 250 micrometers . ≪ / RTI > In some embodiments, the compressible pressure pad preferably has a thickness of 250 micrometers or less, or 10 to 200 micrometers, or 25 to 200 micrometers, or 50 to 200 micrometers.

The compressible pressure pads may have from 1 to 100 grams per square meter, or from 2.5 to 50 grams per square meter, or from 5 to 30 grams per square meter.

The compressible pressure pad comprises a plurality of nonwoven fibers comprising a thermoplastic polymer. The term "thermoplastic ", as used herein, refers to a plastic or meltable material that is melt when heated and becomes brittle, deformable material. Thermoplastics are typically high molecular weight polymers. Examples of thermoplastic polymers that may be used include polyacetals, polyoxyethylene and polyoxymethylene, poly (C1-6 alkyl) acrylates (e.g., poly alkyl acrylates, polyacrylamides, polyamides, (e.g., aliphatic polyamides, polyphthalamides, and polyaramides) ), Polyamideimides, polyanhydrides, polyarylates, polyarylene ethers (e.g., polyphenylene ether (e.g., polyphenylene ether) ethers), polyarylene sulfides (for example, polyphenylene sulfides), polyarylsulfones, polybenzothiazoles, polybenzoxazoles, polybenzoxazoles, poly Polybenzimidazoles, polycarbonates (polycarbonate-siloxanes, polycarbonate-esters, and polycarbonate-ester-siloxane) Polyesters such as polyethylene terephthalates, polybutylene terephthalates, polyarylates, polybutylene terephthalates, polybutylene terephthalates, polycarbonate copolymers, polyester copolymers such as polyarylates and polyester-ethers), polyetheretherketones, polyetherimides (polyetherimides, polyetherimides, polyetherimides, Polyetheretherketone ketones, polyetheretherketone ketones, polyetherketone copolymers, polyetheretherketone copolymers, polyetherketone ketones, Polyetherketones, polyethersulfone, polyimides (including copolymers such as polyimide-siloxane copolymers), poly (C1-6 alkyl < RTI ID = 0.0 & ) Aerials containing norbornenyl units, such as poly (C1-6 alkyl) methacrylates, polymethacrylamides, polynorbornenes (norbornenyl) Including polyolefins (e. G., Polyethylene, polypropylene, polytetrafluoroethylene, and copolymers thereof such as ethylene < RTI ID = 0.0 > (Ethylene-alpha-olefin) copolymers), polyoxadiazoles, polyoxymethylene, polyphthalides, polysilazanes, polysiloxanes polysiloxane, polystyrene (including copolymers such as polystyrenes (acrylonitrile-butadiene-styrene (ABS) and methyl methacrylate-butadiene-styrene (MBS) But are not limited to, polysulfones, polysulfonamides, polysulfonates, polysulfone, polythioesters, polytriazines, polyurea Polyurethanes, polyurethanes, polyvinyl alcohols, polyvinyl esters, polyvinyl ethers, polyvinyl halides, polyvinyl nitriles (for example, polyvinyl nitriles, polyvinyl ketones, polyvinyl thioethers, polyvinylidene fluorides, or the like, or the thermoplastic polymers described above And of combinations comprising at least one. But are not limited to, polyacetals, polyamides (nylons), polycarbonates, polyesters, polyetherimides, polyolefins, and ABS Are particularly useful in a wide variety of technologies, have good processability, and are recyclable.

Useful polyamides include, for example, nylon-6,6 (Nylon-6,6); Nylon-6,9 (Nylon-6,9); Nylon-6,10 (Nylon-6,10); Nylon-6,12 (Nylon-6,12); Nylon-11; At least one of Nylon-12 and Nylon-4,6, preferably Nylon 6 and Nylon 6,6, But are not limited to, synthetic linear polyamides, such as those combinations including, Polyurethanes that may be used include aliphatic, cycloaliphatic, aromatic, and polycyclic polyurethanes, including those described above. In addition, there are some examples, for example, acrylic acid, methyl acrylate, ethyl acrylate, acrylamide, methacrylic acid, Polyacrylates including at least one polymer and copolymer of methyl methacrylate, n-butyl acrylate, and ethyl acrylate, and polyacrylates including polymethacrylate, Polymethacrylates are useful.

Representative examples of polyolefins as thermoplastic polymers include, but are not limited to, polyethylene, polypropylene, polybutylene, polymethylpentene (and copolymers thereof), polynorbornene, (And copolymers thereof), poly (1-butene), poly (3-methylbutene), poly (4-methylpentene) 1-hexene, 1-octene, 1-decene, and 1-decene are used in the present invention. , 4-methyl-1-pentene, and 1-octadecene. Representative combinations of polyolefins include polyethylene and polypropylene, low density polyethylene and high density polyethylene, and olefin copolymers containing polyethylene and copolymerizable monomers, some of which are described above Illustrative, for example, ethylene and acrylic acid copolymers; Ethyl and methyl acrylate copolymers; Ethylene and ethyl acrylate copolymers; Ethylene and vinyl acetate copolymers, ethylene, acrylic acid, and ethyl acrylate copolymers, and copolymers of ethylene, acrylic acid, and vinyl acetate, There are combinations containing vinyl acetate copolymers. In some embodiments, the thermoplastic polymer may comprise a polyolefin elastomer.

Thermoplastic elastomers (TPE), sometimes referred to as thermoplastic rubbers, may be used. TPEs can be a physical mixture of polymers, including copolymers, or rubbers. Examples of TPEs that can be used are styrenic block copolymers (TPE-s), certain polyolefins and polyolefin blends (TPE-o), elastomeric alloys (TPE-v TPV), thermoplastic polyurethanes (TPU), certain copolyesters, and certain polyamides. In some embodiments, the combination of TPEs can be used to achieve desired properties including, for example, blends of polyolefins, processability, elasticity, chemical resistance, etc. to form a nonwoven web Lt; / RTI >

In some embodiments, the thermoplastic polymer is a thermoplastic polyester elastomer (TPEE) comprising a poly (ether-ester) block copolymer. The poly (ether-ester) block copolymers consist essentially of "soft block" long-chain ester units of formula (1).

(One)

Wherein G is derived from a poly (C1-C4 alkylene oxide) glycol having a number-average molecular weight of 400 to 6000, and R20 is an alphatic derived from an aliphatic or aromatic dicarboxylic acid, preferably derived from an aromatic dicarboxylic acid; And "hard block" short-chain ester units of formula (2).

(2)

Wherein D is an alkylene or cycloalkylene derived from a corresponding diol having a molecular weight of C1-C10 300 or less; R20 is derived from C8-C24 alicyclic or aromatic dicarboxylic acid and is preferably an aromatic dicarboxylic acid; Wherein the short chain ester units constitute about 40% to about 90% of the weight of the poly (ether-ester) block copolymer and the long chain ester units comprise about 10% to about 60% of the poly (ether- .

In some embodiments, the hard segments of the thermoplastic polyester elastomer include poly (alkylene terephthalate), poly (alkylene isophthalate), poly (alkylene isophthalate), 1,4-cyclohexene 1,4-cyclohexane-dimethanol-1,4-cyclohexane dicarboxylate), or combinations comprising at least one of the foregoing. In some embodiments, the soft segment of the thermoplastic polyester elastomer is selected from the group consisting of polybutylene ethers, polypropylene ethers, polyethylene ethers, polytetrahydrofurans, And a combination including one. In some embodiments, the soft segment of the thermoplastic polyester elastomer comprises polybutylene ether.

(Ether-ester) copolymers such as ARNITEL EM400 and ARNITEL EL630 from DSM, HYTREL 3078, HYTREL 4056, HYTREL 4556, and HYTREL 6356 poly (Ether-ester) copolymers; And ECDEL 9966 poly (ester-ether) copolymers from Eastman Chemical are commercially available. In all cases, the softblock is derived from tetrahydrofuran. In the case of HYTREL 4556, HYTREL 6356, ARNITEL EM400, and ARNITEL EL630, the hard block is based on poly (butylene terephthalate) (PBT). In the case of the HYTREL 4056 poly (ester-ether) copolymer, the hard block contains isophthalate units in addition to the terephthalate units. In the case of the ECDEL 9966 poly (ether-ester) copolymer, the hard block is a poly (1,4-cyclohexane-dimethanol (1,4-cyclohexane-dimethanol -1,4-cyclohexane dicarboxylate, PCCD) units.

In some embodiments, the TPE is a polyolefin or polyolefin blend, such as polypropylene.

In some embodiments, the thermoplastic polymer has a tensile elongation at break of greater than 100%, preferably greater than 150%, more preferably greater than 300% as determined according to ASTM D638. In some embodiments, the thermoplastic elastomer has a resiliency greater than 50%, preferably greater than 60%, more preferably greater than 65%, measured according to ASTM D4964. In some embodiments, the thermoplastic polymer may have a melt flow index effective to allow melt blowing of the thermoplastic polymer to form a plurality of polymeric fibers. For example, the thermoplastic polymer may have a melt flow index greater than 5 grams per 10 minutes, as measured according to ASTM D1238 or ISO 1133. [ In some embodiments, the nonwoven fibers may comprise a thermoplastic polymer or a combination of thermoplastic polymers effective to provide all of the aforementioned properties.

In some embodiments, the plurality of nonwoven fabrics may exclude glass (i.e., the glass is not intentionally added to the nonwoven fibers).

The thermoplastic polymers can be selected from the group consisting of antiblocking agents, antioxidants, anti-static agents, dyes, and the like in order to provide a thermoplastic composition for the production of nonwoven fabrics. Coupling agents such as colorants, silanes, titanates, or zirconates such as pigments or pigments, heat stabilizers, But are not limited to, light stabilizers, lubricants, opacifying agents, process aids, surfactants, tackifiers, wetting agents ), Or flame retardants. ≪ / RTI > These additives may be blended or otherwise mixed with the thermoplastic polymers, each of which may be present on a basis of 0.01 to 10 weight percent of the thermoplastic polymer.

Light stabilizers include sterically hindered amines, such as bis (2,2,6,6, -tetramethylpiperidyl) -sevacate (bis (2,2,6,6-tetramethylpiperidyl) ) -sebacate, bis- (1,2,2,6,6-phe- tamethylpiperidyl) -sebacate, n-butyl -3,5-di-tert-butyl-4-hydroxybenzyl malonic acid bis (1,2,2,6,6-benzamethylpiperidyl) ester (n-butyl- -butyl-4-hydroxybenzyl malonic acid bis (1,2,2,6,6-pentamethylpiperidyl) ester, succinic acid and 1-hardoxyethyl-1,2,2,6,6-tetramethyl Condensation product of 1-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidine, N, N '- (2,2,6, Tetramethylpiperidyl) hexamethylenediamine (N'- (2,2,6,6-tetramethylpiperidyl) -hexamethylendiamine) and 4-tert-octylamino-2,6-dichloro- condensates of 4-tert-octylamino-2,6-dichloro-1,3,5-s-triazine, tris-2,2,6,6-tetra (2,2,6,6-tetramethylpiperidyl) -nitrilotriacetate), tetrakis- (2,2,6,6-tetramethyl-4-piperidyl) Tetrakis- (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butane-tetra-carbonic acid acid, 1,1 '(1,2-ethanediyl) -bis- (3,3,5,5-tetramethylpiperazinone), 1,1' , 3,5,5-tetramethylpiperazinone) can be used. These amines include di (1-hydroxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate (di- 6-tetramethylpiperidin-4-yl) sebacate): 1-hydroxy-2,2,6,6-tetramethyl-4- benzoxypiperidine); Hydroxy-2,2,6,6-tetramethyl-4- (3,5-di-tert-butyl-4-hydroxyhydrocinnamoyloxy) -piperidine , 6,6-tetramethyl-4- (3,5-di-tert-butyl-4-hydroxy hydrocinnamoyloxy) -piperidine; And N- (1-hydroxy-2,2,6,6-tetramethyl-piperidin-4-yl) -epsilon- piperidin-4-yl) -epsiloncaprolactam. < / RTI > Light stabilizers are typically present in an amount of from 0 to 3.0 wt%, based on the total weight of the thermoplastic polymer, and preferably in an amount of from 0.001 to 2.0 wt%.

Exemplary antioxidants include primary antioxidants, free radical scavengers, and metal deactivators. A non-limiting example of a free radical scavenger is poly [[6- (1,1,3,3-tetramethylbutyl) amino-s-triazine- (2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) Imino]] - (poly [[6- (1,1,3,3-tetramethylbutyl) amino-s-triazine-2,4-diyl] [(2,2,6,6-tetramethyl- imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]]).

Primary oxidants include: (i) Alkylated monophenols, such as 2,6-di-tert-butyl-4-methylphenol

Butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di- 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl- -n-butylphenol), 2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol 2,6-dicyclopentyl-4-methylphenol, 2,6-bis ([alpha] -methylbenzyl) -4-methylphenol 2- [Alpha] -methylcyclohexyl) -4,6-dimethylphenol, 2,6-dioctadecyl-4-methylphenol (2,6- dioctadecyl-4-methylphenol), 2,4,6-tricyclohexyphenol, and 2,6-di-tert-butyl-4-methoxymethylphenol (2,6- di-tert-butyl-4-methoxymethylphenol); (ii) alkylated hydroquinones, such as 2,6-di-tert-butyl-4-methoxyphenol, 2 2,5-di-tert-butyl-hydroquinone, 2,5-di-tert-amyl-hydroquinone, , And 2,6-diphenyl-4-octadecyloxyphenol; (iii) hydroxylated thiodiphenyl ethers such as 2-2'-cyanobis- (6-tert-butyl-4-methylphenol) (2,2'- bis (4-octylphenol), 2,2'-thio-bis- (4-octylphenol) (4,4'-thio-bis- (6-tert-butyl-3-methylphenol)) and 4,4'- (4,4'-thio-bis (6-tert-butyl-2-methyphenol)); (iv) alkylidene-bisphenols such as 2,2'-methylene-bis- (6-tert-butyl-4-methylphenol) bis (6-tert-butyl-4-methylphenol), 2,2'-methylene-bis- methylene-bis- (4-methyl-6 - ([alpha] -methylcyclohexylphenol), 2,2'- alpha] -methylcyclohexyl) phenol), 2,2'-methylene-bis- (4-methyl-6-cyclohexylphenol) (2,2'-methylene-bis- (6-nonyl-4-methylphenol)), 2,2'-methylene-bis (6-nonyl-4-methylphenol), 2,2'-methylene-bis- (6- 4-nonylphenol, 2,2'-methylene-bis- (6- (alpha, alpha-dimethylbenzyl) - (2,2'-methylene-bis- (6- (alpha, alpha-dimethylbenzyl) -4-nonyl-phenol) Bis (4,6-di-tert-butylphenol), 2,2'-methylene-bis- (6-tert-butyl-4-isobutylphenol), 4,4'-methylene-bis- (2,6-di Tert-butylphenol), 4,4'-methylene-bis- (6-tert-butyl-2-methylphenol) Butyl-4-hydroxy-2-methylphenol) butane (1, 4-tert- butylphenol) Butyl-4-hydroxy-2-methylphenol) butane, 1,1-bis- (2- bis (4-hydroxy-5-tert-butylphenyl) butane, 2,2'-isobutylidene- 6-dimethylphenol), 2,6-di- (3-tert-butyl-5-methyl -2-hydroxybenzyl) 4-methylphenol), 1,1,3-tris- (5-tert- butyl-4-hydroxy-2-methylphenyl) -3-dodecyl- tr tert-butyl-4-hydroxy-2-methylphenyl) butane, 1,1-bis- (5-tert- Butene (1,1-bis- (5-tert-butyl-4-hydroxy-2-methylphenyl) -3-dodecyl-mercaptobutane), decylene glycol- -Butyl-4'-hydroxyphenyl) -butyrate) -di- (3-tert-butyl-4-hydroxy-5-methylphenyl) -dicyclopentadiene (ethyleneglycol- (3'-tert-butyl-4'-hydroxyphenyl) -butyrate) -di- (3- tert -butyl-4-hydroxy- 5- methylphenyl) -dicyclopentadiene), and di- Methyl-benzyl) -6-tert-butyl-4-methylphenyl) terephthalate (di- (2- (3'tert-butyl-2'hydroxy-5'methyl- -tert-butyl-4-methylphenyl) terephthalate (v) Benzyl compounds such as 1,3,5-tris- (3,5-di-tert-butyl- (3,5-di-tert-butyl-4-hydroxybenzyl) -2,4,6-trimethylbenzene), bis- Di-tert-butyl-4-hi (3,5-di-tert-butyl-4-hydroxybenzyl) sulfide, isooctyl 3,5-di-tert- butyl-4-hydroxybenzyl-mercapto- 3-hydroxy-2,6-dimethylbenzyl) dithiol-terephthalate (bis- (4-tert- 4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) dithiol-terephthalate, 1,3,5-tris- (3,5-di- tert -butyl-4-hydroxybenzyl) isocyanurate Butyl-4-hydroxybenzyl isocyanurate, 1,3,5-tris- (3,5-di-tert- Benzyl isocyanurate (1,3,5-tris- (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate), 1,3,5- (1H, 3H, 5H) -triene (1,3,5-tris (4-t-butyl- butyl-3-hydroxy-2,6-dimethylbenzyl) -1,3,5-triazine-2,4,6- (1H, 3H, 5H) -trione, dioctadecyl- Butyl-4-hydroxybenzyl-phosphonate (di octadecyl-3,5-di-tert-butyl-4-hydroxybenzyl-phosphonate, monoethyl 3,5-di-tert-butyl Calcium salt of 4-hydroxybenzylphosphonate, 1,3,5-tris- (3,5-dicyclohexyl-4-hydroxybenzyl) isocyanurate (1,3,5- 3,5-dicyclohexyl-4-hydroxybenzyl) isocyanurate; (vi) acylaminophenols, for example, 4-hydroxylauric acid anilide, 4-hydroxy-stearic acid anilide, 2,4-bis-octylmercapto-6- (3,5-tert-butyl-4-hydroxybenzyl) (3,5-di-tert-butyl-4-hydroxy-phenyl) tert-butyl-4-hydroxyphenyl) -carbamate; (vii) beta- (3,5-di-tert-butyl-4-hydroxyphenol) -propionic acid, which is a monohydric or polyhydric, tert-butyl-4-hydroxyphenol) -propionic acid, for example, methanol, dimethylene glycol, octadecanol, trimethylene glycol, 1,6-hexanediol, pentaerythritol, neopentylglycol, tris-hydroxyethylisocyanurate, thiodiethyleneglycol, and the like. Di-hydroxyethyl oxalic acid diamide. These phenols are also known as tetrakis [methylene {3,5-di-tert-butyl-4-hydroxycinnamate}] methane (tetrakis [ / RTI > (viii) 5- (tert-butyl-4-hydroxy-3-methylphenyl) -propionic acid having monohydric or polyhydric alcohols methylphenyl-propionic acid, for example methanol, dimethylene glycol, octadecanol, trimethylene glycol, 1, 2, 3, 4, But are not limited to, 1,6-hexanediol, pentaerythritol, neopentylglycol, tris-hydroxyethyl isocyanurate, thiodiethyleneglycol, Dihydroxyethyl oxalic acid diamide; (ix) Amides of beta- (3,5-di-tert-butyl-4-hydroxyphenol) -propionic acid Amides such as N, N'-di- (3,5-di-tert-butyl-4-hydroxyphenylpropionyl) -hexamethylene- (3,5-di-tert-butyl-4-hydroxyphenylpropionyl) trimethylenediamine (N, N'- , 3,5-di-tert-butyl-4-hydroxyphenylpropionyl) trimethylenediamine, N, N'-di- (N, N'-di-tert-butyl-4-hydroxypropionyl) hydrazine, N, N'-hexamethylenebis [3- (3,5- Bis (3,5-di-tert-butyl-4-hydroxyphenyl) propionamide], and 1,2- Butyl-4-hydroxyhydrocinnamoyl) hydrazine); (x) other Phenolic antioxidants are reaction products of 4-methylphenol with dicyclopentadiene and isobutylene, 1,3-tris (3-methyl-4-hydroxyl-5-t- Butyl-phenyl) -butane; polymeric phenols such as alkylidene-poly-phenols;

Di-tert-butyl-4 (4,6-bis (octylthio) -1,3,5-triazin- - (4,6-bis (octylthio) -1,3,5-triazin-2-ylamino) phenol, 4,6-bis (octylthiomethyl) o-cresol), thiophenols such as ester phenols

Bis [3,3-bis (4-hydroxy-3-tert-butylphenol) butanoic acid] glycol ester ester and 2- [1- (2-hydroxy-3,5-di-tert-pentylphenyl) ethyl] -4,6-di-tert- pentylphenylacrylate -3,5-di-tert-pentylphenyl) ethyl] -4,6-di-tert-pentylphenyl acrylate; (xi) Other primary antioxidants include N-oxides such as bis (octadecyl) hydroxylamine and hydroxylamines. do.

A non-limiting example of a metal deactivator is 2,2-oxydiamidobis [ethyl 3- (3,5-di-t-butoxycarbonyl)], commercially available under the trade name NAUGUARD XL-1 from Chemtura -Butyl-4-hydroxyphenyl) propionate]. A combination comprising a single antioxidant or at least one of the above-described antioxidants may be used. The antioxidant may be present in an amount of up to 3 wt%, specifically 0.5 to 2.0 wt%, based on the total weight of the thermoplastic polymer.

Nonwoven fabrics can be prepared by any method generally known in the art. For example, nonwoven fabrics may be prepared using solution spinning or melt spinning processes. In both melting and solution spinning processes, the material can be put into a fiber production apparatus that is rotated at various speeds until appropriate dimensions of fibers are produced. The materials may be formed, for example, by melting the solute, or may be a solution formed by dissolving a mixture of the solute and the solvent. Any solution or melt familiar to those of ordinary skill in the art may be used. In the case of solution spinning, a material may be designed to achieve a desired viscosity, or a surfactant may be added to improve flow, or a plasticizer may be added to dilute the rigid fiber have. In the case of melt spinning, the solid particles may comprise, for example, a metal or a polymer, and the polymer additives may be combined with the latter.

In some embodiments, the fibers may be formed by centrifugal spinning. In a preferred embodiment, the fibrous mat comprises a plurality of centrifugally spun fibers. In other embodiments, the fibrous mat comprises a plurality of centrifugally spun fibers formed from a thermoplastic polymer.

Centrifugal radiation can produce microfibers and nanofibers from a wide range of materials. As is known to those of ordinary skill in the art, centrifugal spinning uses centrifugal forces rather than electrostatic forces to rotate the fibers. In centrifugal spinning, solution or solid materials can be solution-spun or melt-spun to become fibers. The main parameters for controlling the geometry and morphology of the fibers can include the rotational speed of the spinneret, the collection system and the temperature. The orifices of the radiation exposure may have any geometric shape to provide a cross-section of the corresponding fibers. In a preferred embodiment, the centrifugal spinning produces microfibers or nanofibers, preferably nanofibers. Centrifugal radiation is described, for example, in US 3388194; US4790736; US 7786034; US 8647540; US 8647541; US8658067; US 8709309; And US8721319. Nanofiber mats are available from Forcespinning (TM), a trade name of FibeRio Technology Corporation (McAllen, TX).

In solution or melt spinning processes, when material is ejected from the spinning fiber production apparatus, thin jets of material are stretched at the same time, dried and stretched and cooled in the ambient environment. Interactions of matter with the environment at high strain rates (due to stretching) can solidify the material into fibers and may accompany evaporation of the solvent. Non-limiting examples of solvents that may be used include oils, lipids, and organic solvents such as DMSO, toluene and alcohols. Water, such as de-ionized water, can also be used as a solvent. By manipulating the temperature and strain rate, the viscosity of the material can be controlled to manipulate the size and shape of the resulting fibers. Non-limiting examples of fibers made using the melt centrifugal spinning process include polypropylene, acrylonitrile butadiene styrene (ABS), and nylon fibers. Non-limiting examples of fibers made using the solution centrifugation method include polyethylene oxide (PEO) and beta-lactam fibers.

Methods for producing fibers also include the class of methods described by melt fibrillation. Molten fibrosis is a process in which one or more polymers are molten and extruded into many possible configurations such as co-extrusion, homogeneous or bicomponent films or filaments, And then defined as being fibers that are fibrillated or fiberized. Non-limiting examples of melt fiberization processes include melt blowing, melt film fibrillation, and melt fiber bursting. Methods for producing fibers that are not melts include film fibrillation, electro-spinning, and solution spinning. Other methods of producing nanofibers include, but are not limited to, islands-in-the-sea, segmented pie, or other configurations in which nanofibers are co- Gt; bicomponent < / RTI > fibers.

Melt blowing is a commonly used method for producing fibers. In meltblowing, the thermoplastic polymer is typically stored in an extruder hopper in the form of beads, pellets, or chips. The extruder shaft or screw exerts a force on the polymer from the feed hopper to the melting section. The continuous polymer of the extruder is then exposed to increasing temperatures in consecutive heating zones. As the polymer passes through the extruder, the molten material is heated until it finally reaches the desired meltblowing temperature before being forced through the meltblowing die. As the molten polymer exits the die through a row of orifices, the tip is attenuated by hot jets and high velocity air forms fibers drawn into very fine diameters. The fibers are then collected or quenched on a moving belt or screen to form a continuous web of nonwoven fibers containing nanofibers or microfibers. Examples of meltblowing are described in US 8,608,817; US 8,395,016; US 8,277,711; US 7,501,085; US 3,825,380, and EP2019875 B1.

Melt film fibrillation is a method for producing other fibers. After the molten film tube is produced from the melt, a fluid is used to form the nanofibers from the film tube. Examples of such methods are described in U.S. Patent Nos. 6,315,806; 5,183,670; 4,536,361; 6,382,526; 6,520, 425, and 8,395, 016. Although these methods are similar to forming molten film tubes for the first time before they become fibers, the process uses different temperatures, flow rates, pressures, and equipment.

Film fibrillation is not yet designed for the production of polymeric fibers to be used in nonwoven webs, but is another way of producing fibers. U.S. Patent No. 6,110,588 to Perez et al. Describes a method for forming nanofibers by transferring fluid energy to the surface of a highly crystalline, highly crystalline, melt-treated polymeric film. Films and fibers are useful for high strength applications such as reinforcement fibers for polymers or cast building materials such as concrete.

Electrospinning is a commonly used method for producing fibers. In this method, the polymer is dissolved in a solvent, and one end is sealed and the other end is located in a chamber having a small opening in the narrow neck. A high voltage potential is then applied between the polymer solution and a collector near the open end of the chamber. The production rates of this process are very slow and the fibers are typically produced in small quantities. Electrospinning is described, for example, in US 8,178,030, US 8,518,320, US 8,066,932, US 7,815,427; And US 7,575,707. The spinning technique for producing other fibers is a solution or flash using solvent.

Two-step methods for producing fibers are also known. The two-step process is defined as the formation of fibers in which the second step occurs after the average temperature across the fibers is significantly lower than the melting point temperature of the polymer contained in the fibers. In general, the fibers will either be solidified or mostly solidified. The first step is to rotate the large diameter multicomponent fibers in an islands-in-the-sea, segmented pie or other configuration. The large diameter multicomponent fibers are then split or dissolved in the sea, leading to a second stage of nanofibers. For example, U.S. Patent No. 5,290,626 to Chisso and U.S. Patent No. 5,290,626 to Nishio et al. And U.S. Patent No. 5,935,883 to Pike et al., Assigned to Kimberly-Clark, describe the island-in-the-sea and segment pie methods, respectively. These processes include two sequential steps of making fibers and dividing the fibers.

The fabrication of the fibers may be performed in batch modes or in continuous modes. In the latter case, the material is continuously injected and the fiber production apparatus and process continue over several days (e.g., 1 to 7 days), even weeks (1 to 4 weeks)

In an embodiment, the fiber manufacturing method comprises the steps of: heating a thermoplastic polymer; Positioning the material in a heated fiber production apparatus; And rotating the fiber production apparatus to eject the material to produce nanofibers from the material after positioning the heated fluoride in the heated fiber production apparatus. In some embodiments, the fibers may be microfibers or nanofibers. The heated fiber production apparatus has a structure having a temperature higher than the ambient temperature. "Heating a material" is defined as increasing the temperature of a material to a temperature above ambient. "Melting a material" refers to raising the temperature of the material to a temperature that exceeds the melting point of the material, or, in the case of polymeric materials including thermoplastic polymers, raising the temperature above the glass transition temperature of the polymeric material Is defined. In alternative embodiments, the fiber production apparatus is not heated. Indeed, for any embodiment employing a fiber production apparatus that can be heated, the fiber production apparatus can be used without being heated. In some embodiments, the fiber production apparatus is heated but the material is not heated. The material is heated by being placed in contact with the heated fiber production apparatus. In some embodiments, the material is heated and the fiber production apparatus is not heated. The fiber production apparatus is heated in contact with the heated material.

The spun fibers can then be collected. "Collection" of fibers here refers to fibers that are stopped by a fiber collection device. After the fibers are collected, the fibers can be removed from the fiber collection device by a person or robot. Various methods and fiber (e.g., nanofiber) collecting devices can be used to collect the fibers. With respect to the collected fibers, in certain embodiments, at least some of the collected fibers are continuous or discontinuous and nonwoven.

In some embodiments, at least some of the fibers are crosslinked at a point of contact between the fibers. Crosslinking agents are typically used to effectively crosslink between polymer chains and may be included in the thermoplastic polymer composition. Exemplary crosslinking agents include carbodiimides, isocyanates, compounds having at least one ethylenic unsaturation, and the like. In some embodiments, the cross-

Two or more vinyl groups that can be crosslinked by initiation of photopolymerization, such as ethylene glycol dimethacrylate, diethylene glycol di (meth) acrylate, Triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, Butylene glycol di (meth) acrylate, 1,4-butylene glycol di (meth) acrylate, 1,4-butanediol di Butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, such as neopentyl glycol di (meth) acrylate, ethoxylated bisphenol di (meth) acrylate, (C1-20 alkyl) (meth) acrylates such as trimethylolpropane tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, (Meth) acrylates such as polyfunctional (C1-20 alkyl) (meth) acrylate esters and polyethylene glycol di (meth) acrylate), and And oligomers or monomers comprising a combination comprising at least one of the foregoing. A crosslinking initiator, for example, a photoinitiator, a crosslinking accelerator, or a combination comprising at least one of these may be included in the thermoplastic composition. In some embodiments, the compressible pressure pad excludes foam, or the compressible pressure pad lacks foam, such as, for example, a polymer foam. For example, a compressible pressure pad may exclude polyurethane foam.

Subassemblies including compressible pressure pads are particularly useful in a variety of electronic display devices, e.g., mobile electronic display devices. Exemplary mobile electronic devices that may include subassemblies including compressible pressure pads include, but are not limited to, cellular telephones, smart phones, laptop computers, tablet computers, etc. .

Thus, in a particular embodiment, a mobile electronic device includes a display component (e.g., a liquid crystal display component, a light emitting diode component, and a display device) having a screen component and an external display surface, (light emitting diode component), an organic light emitting diode component, etc.) and the screen contacts the external display surface of the display component. The compressible pressure pad has a plurality of nonwoven fibers having an average diameter of less than or equal to 10 micrometers and disposed on an inner surface of the display component and an inner component of the display device. The nonwoven fabrics include thermoplastic polymers. Preferably, the thermoplastic polymer comprises a TPE such as a polyolefin (e.g., polypropylene), or a thermoplastic polyester elastomer. The compressible pressure pad may have a thickness of from about 50 micrometers to about 1 millimeter and from about 5 to about 30 grams per square meter. The compressible pressure pad may be devoid of foam, preferably a polymeric foam.

A method for eliminating the ripple effect in an electronic display device, preferably a liquid crystal display device or a light emitting diode device (for example, an organic light emitting diode (OLED) device) is also provided. The method includes combining a compressible pressure pad comprising a plurality of nonwoven fibers having an average diameter of less than 100 micrometers in an electronic display device. The compressible pressure pad may be as described above. A compressible pressure pad is coupled between the internal component and the display component described above.

The device may optionally include an adhesive layer comprising one or more intervening layers, for example an optically clear adhesive, between the display component and the compressible pressure pad.

In some embodiments, the article may comprise one or more intervening layers, e.g., an adhesive layer, between the polymer foam composite and the internal components of the electronic device. In some embodiments, the adhesive layer may be a pressure sensitive adhesive. The pressure-sensitive adhesive material (PSA) used here is adhered by a pressure as small as a finger. The adhesive may optionally be further cured by exposure to ultraviolet light in the presence of, for example, a photoinitiator, such as certain radiation-curable acrylate / silicone PSAs. . The PSAs may comprise a primary elastomer as an adhesive elastomer and a selective tackifier. Examples of elastomers include copolymers thereof with (C1-6 alkyl) poly (meth) acrylate (C1-6 alkyl) poly (meth) acrylate - (meth) acrylic acid Natural rubber such as polyvinyl alcohol, polyvinyl acetate, polyvinyl ether, and butyl rubber, styrene block copolymer (hereinafter referred to as " styrene block copolymer " ), Silicone, and nitrile rubbers, such as polytetrafluoroethylene (PTFE). Examples of tackifiers include various terpene resins, aromatic resins, and hydrogenated hydrocarbon polymers. In some embodiments, the pressure sensitive adhesive preferably comprises (C1-6 alkyl) poly (meth) acrylate ((C1-6 alkyl) poly (meth) acrylate). Advantageously, the adhesive layer can be laced using lamination techniques and conditions commonly known to compressible pressure pads (i.e., nonwoven materials). In contrast, foamed materials require the use of a liner material, and the foam is cast on an adhesive layer supported by a layer. In addition, since the foam is a pre-cure case, the choice of adhesive material can be limited to being able to withstand curing conditions (i.e., cure temperatures).

Yet another embodiment is a method for improving impact absorption in a display device comprising a display component disposed on an internal component. The method includes compressing a compressible pressure pad between a display component and an inner component, the plurality of nonwoven polymer fibers having an average diameter of less than 100 micrometers; The compressible pressure pad has a thickness of 200 micrometers or less, preferably 150 micrometers or less.

The nonwoven material described above represents another aspect of the present disclosure. The nonwoven material comprises a plurality of polymeric fibers having an average diameter of less than or equal to 100 micrometers and having a thickness of less than or equal to 200 micrometers. The plurality of nonwoven fabrics preferably include a thermoplastic polymer. In some embodiments, the thermoplastic polymer has a tensile elongation of greater than 100% as measured according to ASTM D638, and preferably greater than 50%, preferably greater than 60%, as measured according to ASTM D4964 Preferably greater than 5 grams per 10 minutes, having a resiliency of greater than 65% and measured in accordance with ASTM D1238 or ISO 1133. The melt flow index is measured in accordance with ASTM D 1238 or ISO 1133. [ Advantageously, the above-described nonwoven materials exhibit an impact strength reduction of 4% or more, preferably 10% or more, as compared to a surface not comprising nonwoven material. Impact force reduction can be determined by a ball drop impact test, for example, by dropping a 4.3 gram ball above 30.5 centimeters from the sample. The determination of the impact force reduction using the ball drop is further illustrated in the working example below.

In some embodiments, the nonwoven materials can provide improved shock absorption when placed on glass. For example, the nonwoven materials on the glass surface may be at least 60%, preferably from 60% to 95%, preferably from 60% to 95%, as determined by dropping a steel ball from 10 centimeters high to 10 grams, More preferably from 65 to 90%; A reduction in impact of at least 20%, preferably 20 to 50%, more preferably 25 to 45%, as compared to a glass surface without a nonwoven material, determined by dropping 30.6 grams of steel balls from a height of 20 centimeters; And at least one impact force reduction of at least 30%, preferably 30 to 50%, as compared to a glass surface that does not contain a nonwoven material, determined by dropping a 55 gram steel ball from a height of 20 centimeters. In some embodiments, the nonwoven material disposed on the glass surface is at least 20%, preferably 20 to 50%, as compared to a glass surface that does not contain nonwoven material, determined by dropping a steel ball of 30.6 grams from a height of 20 centimeters %, More preferably 25 to 45%, still more preferably 30 to 45%.

In some embodiments, the nonwoven material may comprise single row or multi-row meltblown polymer fibers. Preferably, the nonwoven material comprises multi-row meltblown polymer fibers. In some embodiments, the single row meltblown polymer fibers have an average diameter of 4 to 7 micrometers, preferably 5 to 7 micrometers, the multi-row meltblown polymeric fibers have a mean diameter of 7 to 15 micrometers, Has an average diameter of 10 to 15 micrometers. The diameter of the polymer fibers can be determined using scanning electron microscopy (SEM). In some embodiments, the plurality of nonwoven fabrics are multi-row meltblown polymer fibers, the nonwoven material is determined by dropping 10 gram steel balls from a height of 10 centimeters, and is at least 70% , Preferably 70 to 95%, more preferably 75 to 90%; And at least 30%, preferably 30 to 50%, more preferably 30 to 45%, of the impact force reduction determined by dropping the 30.6 gram steel ball from the height of 20 centimeters to the glass surface not including the nonwoven material One.

In some embodiments, the nonwoven material has a thickness of less than 150 micrometers, the plurality of nonwoven fibers are multi-row meltblown polymer fibers, the nonwoven material is determined by dropping a 10 gram steel ball from a height of 10 centimeters, A reduction in impact of at least 80%, preferably 80 to 90%, compared to a glass surface not comprising the material; And at least one of an impact force reduction of at least 40%, preferably 40 to 50%, as determined by dropping a 30.6 gram steel ball from a height of 20 centimeters, compared to a glass surface not comprising nonwoven material.

Another embodiment is an article comprising the nonwoven material described above. As already described, the nonwoven material may be particularly useful for subassembly for display devices. The article can be a back pad, foam tape, or gasket for hand-held electronic devices. The nonwoven materials described herein may also be useful as various internal electronic components or back pads for camera lenses.

What is provided herein are nonwoven materials having a combination of properties that are particularly useful for use as back pads or compressible pressure pads in subassemblies for display devices. Combining such materials with display assemblies or subassemblies for display devices can unexpectedly provide a way to reduce ripple effects or improve shock absorption in a display device.

Examples

Example 1

The examples below illustrate the results of an extended compression test on three compressible pressure pads prepared according to this disclosure and three foam materials as a comparative example.

The compressible pressure pad comprises a thermoplastic poly (ether-ester) elastomer comprising butylene terephthalate units and tetramethylene ether glycol terephthalate units to form a plurality of fibers (poly (ether-ester) elastomer). The fibers were collected to form a fibrous mat. The fibers had an average diameter of 3 micrometers and as a result the pressure pads had a total thickness of 120 micrometers and weighed 20 grams per square meter ("Hytrel 30 gsm"). Additional pressure pads with a basis weight of 30 grams per square meter were made from this same material ("Hytrel 30 gsm"). A third pressure pad was made from meltblown Vistamaxx available from ExxonMobil with a basis weight of 20 grams per square meter ("Vistamaxx 20 gsm").

The compression of the above-mentioned compressible pressure pads was achieved by using an open-celled polyurethane foam (PORON Shockpad 79 from Rogers Corp.) having a density of pounds per square foot (pcf) or 20 pcf ), And closed-cell polypropylene foam (obtained with Super Clean Foam SCF available from Nitto) having a density of 2.5 pcf.

As shown in Figure 2, the compressible pressure pads exhibit compressibilities that are more similar or better than those observed in the comparison forms. It was observed that the nonwoven materials were more compressible for lower strain (i.e., less than 50%) and more compressible than polyurethane foams at higher strain. For example, nonwoven materials have been observed to be more compressible at lower pressures than foam materials. The nonwoven fabric

A nonwoven fabric made from a meltblown thermoplastic poly (ether-ester) elastomer having a weight of 20 gsm exhibited a strain of 60% under an applied stress of 0.023 Mpa and a meltblown thermoplastic The nonwoven fabric made from the poly (ether-ester) elastomer exhibited a strain of 60% under the applied stress of 0.035 Mpa and the nonwoven fabric made from the meltblown Vistamaxx with a weight of 20 gsm had an applied Strain under 60% strain. In contrast, in order to compress the open cell polyurethane foam to a strain of 60%, a stress of about 0.13 MPa (20 pcf) and about 0.04 MPa (15 pcf) is required and the closed cell polypropylene foam is subjected to a strain of 60% , An applied stress of about 0.025 MPa was required. Nonwoven materials are generally more compressible at lower strains than open cell polyurethane foams, i.e. lower pressure is required to compress to a thickness in a lower strain regime than foam materials. At high strain areas (i.e., above 50%), the nonwoven materials were more compressible than open cell polyurethane foams.

Example 2

Nonwoven materials were tested for impact performance.

Impact testing was performed using pad materials according to the present disclosure, and the results were compared to various foam materials. The thickness of the materials has also changed. Each impact test was performed three times, and the results were averaged to obtain the reported values. The results were reported as a percentage reduction in the measured impact force ("reduced percentage") by comparing the impact force measured for each material with the control drop excluding the shock absorbing material.

The various impact-absorbing materials tested were described in Table 1. [ Though the thickness varied from 0.1 to 0.25 millimeters, each material had a basis weight of grams (gsm) per 20 square meters

One A multi-row meltblown nonwoven pad made from a polyolefin elastomer obtained with Vistamaxx 7050 FL available from ExxonMobil and having a thickness of 0.25 mm and reduced tack during meltblowing 2* A closed cell polypropylene foam with a thickness of 0.23 mm and obtained with Nitto's Super Clean Foam SCF 400 3 A 0.2 mm thick single row meltblown nonwoven pad made from a polyolefin elastomer, modified to reduce tack during meltblowing and obtained with Vistamaxx 7050 FL available from ExxonMobil, 4* Obtained with a PORON Shockpad (79) foam available from Rogers Corporation and having an open cell polyurethane foam with a thickness of 0.2 millimeters and a density of 20 pcf 5 * Open cell polyurethane foam with a thickness of 0.2 millimeters and a density of 15 pcf, obtained with a PORON Shockpad (79) foam available from Rogers Corporation 6 * A closed cell polyolefin foam obtained with WL020 foam of Sekisui Chemical Co. having a thickness of 0.2 millimeters 7 * A closed cell polypropylene foam having a thickness of 0.15 mm obtained with Nitto's Super Clean Foam SCF 400 8* Open cell polyurethane foam with a thickness of 0.15 millimeters and a density of 20 pcf, obtained with the PORON Shockpad (79) foam available from Rogers Corporation 9 * Open cell polyurethane foam with a thickness of 0.15 millimeters and a density of 15 pcf, obtained with a PORON Shockpad (79) foam available from Rogers Corporation 10 * A closed cell polyolefin foam obtained with WL020 foam of Sekisui Chemical Co. having a thickness of 0.15 mm 11 A closed cell polyolefin foam obtained with WL020 foam of Sekisui Chemical Co. having a thickness of 0.15 mm 12 A multi-row meltblown nonwoven pad having a thickness of 0.15 mm comprising a thermoplastic polyester elastomer comprising poly (ether-ester) 13 * Open cell polyurethane foam with a thickness of 0.1 millimeters obtained with PORON Shockpad (79) foam available from Rogers Corporation

* Represents the comparative substance.

The nonwoven materials 1, 3, 11, and 12 were prepared as described above for compression testing.

In order to test various shock absorbing materials, standard low mass impact testing conditions were used. A steel ball having a mass of 4.3 grams dropped from a height of 30.5 cm above the sample. The impact force was recorded and compared to the impact force measured without shock absorber material to provide a reduction in force in percent. The results are shown in FIG. As shown in Figure 3, impact pads comprising nonwoven materials based on blends of polyolefin elastomer and polypropylene (as shown in Figure 3) exhibited an impact reduction of about 12% at a thickness of 0.2 millimeters, Cell polypropylene foam (shown at 2 *, indicating an impact reduction of about 3%) and a closed cell polyolefin foam (obtained at Sekisui Chemical Co., of similar thickness, exhibiting an impact force reduction of about 5.5%) It surpassed. Each of the thinner nonwoven materials having a thickness of 0.15 mm made from a thermoplastic polyester elastomer (shown at 11 and 12) exhibited an impact reduction of 4 to 5% and appeared in closed cell polypropylene foam (7 *, 2.5 % Impact strength reduction) and a closed cell polyolefin foam obtained from Sekisui Chemical Co. of similar thickness (shown at 10 * and exhibiting a 3.5% impact reduction).

Impact reduction of the above-described materials has been further characterized in the presence of glass to mimic the performance of materials as part of the display device. At a given thickness, each material was placed between the pressure sensor and the glass layer, and the impact force was measured using a ball drop test. Each impact test was performed three times and the results were averaged to obtain the reported value. The results were reported as a percentage reduction in the impact force ("percent reduction") measured by comparing the impact drop measured for each material with the control drop excluding the shock absorbing material (ie, only glass and pressure sensors).

In the first example, a 10 gram steel ball was dropped from a height of 10 centimeters. Were tested at nine different points, and ball drops were repeated three times at each point. The results are shown in FIG. Sample 1, which had a thickness of 0.25 mm, exhibited an impact reduction of 70 to 80 percent. Sample 3 with a thickness of 0.2 millimeters exhibited an impact reduction of about 65%, which is similar to open cell polyurethane foam (4 * and 5 *) and closed cell polyolefin foam (6 *) obtained from Sekisui Chemical Co. Respectively. Thinner nonwoven materials having a thickness of less than 0.15 millimeters produced from thermoplastic polyester elastomers (as shown in 11 and 12) exhibited impact reductions of 70 and 85%, respectively, and each exceeded the comparative materials tested at this thickness . Interestingly, thermoplastic polyester elastomeric nonwoven materials having the same overall thickness but including single row meltblown fibers or multiple row meltblown fibers exhibited different impact strength reductions and multi-row meltblown nonwoven fabrics exhibited about 10% , Which exceeds the corresponding single row meltblown nonwoven fabric.

The materials were further tested for impact performance at a moderate level of force using a steel ball weighing 30.6 grams dropped from a height of 20 centimeters. As in the tests described above, each material at a given thickness was placed between the pressure sensor and the glass layer. Impact reduction for each material measured according to this procedure is provided in FIG. As shown in FIG. 5, blends of polyolefin elastomer and polypropylene (shown at 1 and 3) exhibited similar impact strengths of about 30%, despite different sample thicknesses (Sample 1 is 0.25 millimeters, Sample 3 is 0.2 millimeters) Respectively. Sample 3 surpassed all other materials tested (sample 2 * and 4 * -6 *) at a thickness of 0.2.

For materials having a thickness of 0.15 mm, the single row meltblown thermoplastic polyester elastomer of Sample 11 exhibited equivalent performance to foam materials, i.e., 20-25% impact reduction. Interestingly, the multi-row meltblown thermoplastic polyester elastomer exhibited an increased impact force reduction of 40-45% at the same thickness.

The average fiber diameter of the polymer fibers of nonwoven materials was further analyzed using SEM. Interestingly, the single row meltblown fibers 3 and thermoplastic polyester elastomer 11 made from a polyolefin elastomer and a polypropylene blend each exhibited an average diameter of 4 to 7 micrometers and 5 to 7 micrometers, respectively. In contrast, the multi-row meltblown fibers 1 and the thermoplastic polyester elastomer 12 made from a blend of polyolefin elastomer and polypropylene each have an average diameter of 7 to 15 micrometers and 10 to 15 micrometers . It is believed that the different average fiber diameters when produced by a single row or multi-row meltblown process can affect the impact properties of the resulting nonwoven material.

The materials were tested for impact performance with higher forces using a steel ball weighing 55 grams dropped from a height of 20 centimeters. As in the tests described above, each material at a given thickness was placed between the pressure sensor and the glass layer. Impact reduction for each material measured according to this procedure is provided in FIG. As shown in FIG. 6, each of the nonwoven materials according to the present disclosure (1, 3, 11, and 12) showed similar performance to other materials in each of the thickness groups.

The compressibility and impact performance tests described above, and the data provided in Figures 2-6, can be used for pressure-pads and / or impact-absorbing pads, particularly hand-held devices, that can advantageously compress nonwoven materials comprising polymeric fibers .

In a particularly advantageous aspect, the nonwoven materials according to the present disclosure unexpectedly provide superior impact reduction, especially in materials having a thickness of 0.2 millimeters or less, or 0.15 millimeters or less.

 The sub-assemblies, devices, and methods described herein are further illustrated in the following embodiments, which are non-limiting.

Embodiment 1: A sub-assembly for a display device, comprising: a display component comprising an external display surface and an opposite internal surface; The compressible pressure pad comprises a plurality of nonwoven fibers having an average diameter of less than 100 microns and is disposed on an inner surface of the display component; And an internal component disposed on the compressible pressure pad on the opposite side of the display component.

Example 2: Subassembly of Example 1, wherein the plurality of nonwoven fabrics comprise a thermoplastic polymer.

Example 3: The subassembly of Example 2, the thermoplastic polymer, is selected from the group consisting of polyacetal, poly (C1-6 alkyl) acrylate, polyamide, polyamideimide polyamideimide, polyanhydride, polyarylate, polyarylene ether, polyarylene sulfide, polyarylsulfone, polybenzothiazole, and the like. Polybenzoxazole, polybenzimidazole, polycarbonate, polyester, polyetheretherketone, polyetherimide, polyetherketoneketone, polyetheretherketone, polyetherketone, polyetherketone, Polyetherketone, polyethersulfone, polyimide, poly (C1-6 alkyl) methacrylate, polymethacrylamide (polymethyl methacrylate) polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, ethacrylamide, polyolefin, polyoxadiazole, polyphthalide, polysilazane, polysiloxane, polystyrene, polysulfide, polysulfones, polysulfones, polysulfides, polythioesters, polytriazines, polyureas, polyurethanes, polyvinyl alcohols, and the like. Polyvinyl esters, polyvinyl ethers, polyvinyl halides, polyvinyl nitriles, polyvinyl ketones, polyvinylidene fluorides, and the like. , Or combinations comprising at least one of the foregoing thermoplastic polymers.

Example 4: Subassembly of Example 2 or 3, wherein the thermoplastic polymer is a thermoplastic elastomer.

Example 5: Subassembly of Example 4 - The thermoplastic polymer has a tensile elongation at break of more than 100%, preferably more than 150%, more preferably more than 300%, measured according to ASTM D638 elongation at break); A resiliency of more than 50%, preferably more than 60%, more preferably more than 65%, measured according to ASTM D4964; A melt flow index which is effective to allow melt blowing of the thermoplastic polymer, measured according to ASTM D1238 or ISO 1133, preferably the thermoplastic polymer has a melt flow index < RTI ID = 0.0 > With -.

Example 6: One or more subassemblies from Examples 3-5, wherein the nonwoven fibers comprise a combination of thermoplastic polymers effective to provide all the properties of Example 5 or a thermoplastic polymer.

Example 7: One or more sub-assemblies of Examples 4-6, wherein the thermoplastic elastomer comprises a hard segment comprising a soft segment comprising a polyether block and a polyester block.

Example 8: The sub-assembly of Example 7, wherein the hard segments of the thermoplastic polyester elastomer are poly (alkylene terephthalate), poly (alkylene isophthalate), poly (alkylene isophthalate) ≪ / RTI > The soft segment of the thermoplastic polyester elastomer includes polybutylene ether, polypropylene ether, polyethylene ether, or a combination comprising at least one of the foregoing, preferably polybutyl ether, Containing polybutylene ether.

Example 9: One or more subassemblies of Examples 2 to 8, wherein the thermoplastic polymer comprises a polyolefin, preferably polypropylene.

Example 10: One or more sub-assemblies of Examples 1-10, wherein the plurality of nonwoven fabrics further comprise a crosslinking agent.

Example 11: One or more subassemblies of Examples 1-10, wherein at least a portion of the plurality of fibers are cross-linked at the points of contact of the fibers.

Example 12: Subassemblies of Examples 10 to 11 Crosslinking occurs during or after fiber production.

Example 13: One or more subassemblies of claims 1 to 12, wherein the plurality of nonwoven fabrics exclude glass.

Example 14: One or more subassemblies of Examples 1-13, wherein the compressible pressure pads are 10 micrometers to 10 millimeters, or 50 micrometers to 5 millimeters, or 50 micrometers to 2 millimeters, or 50 micrometers to 1 millimeter Millimeters, or 50 to 500 micrometers, or 50 to 250 micrometers.

Example 15: One or more subassemblies of Examples 1-13, wherein the compressible pressure pad is 250 micrometers or less, or 10 micrometers to 200 micrometers, or 25 micrometers to 200 micrometers, or 50 to 200 micrometers With a thickness of.

Example 16: At least one subassembly of Examples 1-15, wherein the plurality of fibers are 0.5 nanometer to less than 100 micrometers, or 0.5 nanometer to 80 micrometers, or 1 nanometer to 50 micrometers; 0.5 nanometers to 10 micrometers, or 10 nanometers to 8 micrometers, or 100 nanometers to 5 micrometers; Or an average diameter of 250 nanometers to 5 micrometers, or 500 nanometers to 5 micrometers, or 750 nanometers to 5 micrometers, or 1 to 5 micrometers.

Example 17: Subassemblies of Examples 1-16 Compressible pressure pads have an average distance between fibers of 0.05 nanometers to 50 millimeters, or 0.1 nanometers to 1 millimeter, or 1 nanometer to 500 micrometers, .

Example 18: One or more subassemblies of Examples 1-17, wherein the compressible pressure pad has a weight per gram of 1 to 100 square meters, or 2.5 to 50 grams per square meter, or 5 to 30 grams per square meter.

Example 19: One or more subassemblies of Examples 1-18, wherein the compressible pressure pads exclude the foam.

Embodiment 20: One or more sub-assemblies of embodiments 1 to 19, further comprising: a screen disposed on the outer surface of the display component.

Embodiment 21: The subassembly of embodiment 20, further comprising an adhesive layer disposed between the display component and the screen.

Embodiment 22: One or more subassemblies of embodiments 1-21, further comprising an adhesive layer disposed on one or both sides of the compressible pressure pad.

Example 23: Subassembly of Example 21 or 22, wherein the adhesive layer comprises an optically clear adhesive.

Embodiment 24: One or more subassemblies of embodiments 1-23, wherein the display component is a liquid crystal display component.

Embodiment 25: One or more sub-assemblies of embodiments 1-24, the display component is a light emitting diode display component, preferably an organic light emitting diode display component, .

Embodiment 26: A display device comprising one or more subassemblies of any one of embodiments 1 to 24, wherein the display device is a mobile electronic device.

Embodiment 27: The display device of embodiment 26, wherein the mobile electronic device is a cellular telephone, a smart telephone, a laptop computer, or a tablet computer.

Embodiment 28: A light emitting diode display component or liquid crystal display component having an external display surface and an opposite internal surface, a screen disposed on the external display surface of the display component; A compressible pressure pad disposed adjacent the interior surface of the display component, the compressible pressure pad having an average diameter of less than 100 micrometers, a thickness of 50 micrometers to 1 millimeter, a weight per gram of 5 to 30 square meters A plurality of non-woven, thermoplastic fibers having a thickness of less than 200 micrometers and devoid of foam; And an internal component disposed on the compressible pressure pad of the opposite side of the display component.

Embodiment 29. A mobile electronic display device, preferably a mobile electronic display device, comprising a sub-assembly of embodiment 28, which is a cellular phone, a smartphone, a laptop computer, or a tablet computer.

Embodiment 30: A method for reducing the ripple effect in a display device comprising a display component disposed on an internal component, the method comprising: providing a plurality of display components having an average diameter of less than 100 micrometers between the display component and the internal component And incorporating a compressible pressure pad comprising nonwoven fibers.

Embodiment 31. A method for improving impact absorption in a display device comprising a display component disposed on an internal component, the method comprising: providing a plurality of display devices having an average diameter of less than 100 micrometers between a display component and an internal component Incorporating a compressible pressure pad comprising nonwoven fibers; - the compressible pressure pad has a thickness of 200 micrometers or less, preferably 150 micrometers or less.

Example 32: Nonwoven material comprising a plurality of nonwoven polymeric fibers having an average diameter of less than 100 micrometers and a thickness of less than 250 microns, the plurality of nonwoven polymeric fibers having a density greater than 100%, measured according to ASTM D638 Breaking elongation; A resiliency of more than 50%, preferably more than 60%, more preferably more than 65%, measured according to ASTM D4964; And a thermoplastic elastomer having a melt flow index greater than 5 grams per 10 minutes measured in accordance with ASTM D1238 or ISO 1133, the nonwoven material exhibiting an impact strength reduction of at least 4%, preferably at least 10%.

Example 33: For the nonwoven material of Example 32, the nonwoven material disposed on a 1 millimeter thick glass surface was a nonwoven material, determined by dropping a 10 gram steel ball from a height of 10 centimeters , An impact force reduction of at least 60%, preferably 60 to 95%, more preferably 65 to 90%, compared to a glass surface not containing a glass transition temperature A reduction in impact of at least 20%, preferably 20 to 50%, more preferably 25 to 45%, as compared to a glass surface containing no nonwoven material, determined by dropping 30.6 grams of steel ball from a height of 20 centimeters; Exhibit at least one of an impact reduction of at least 30%, preferably 30 to 50%, as compared to a glass surface that does not contain a nonwoven material, determined by dropping 55 grams of steel ball from a height of 20 centimeters.

Example 34: For the nonwoven material of Example 32 or 33, the nonwoven material is disposed on a glass surface, and the nonwoven material comprises a nonwoven material determined by dropping a 30.6 gram steel ball from a height of 20 centimeters Exhibit an impact force reduction of at least 20%, preferably 20 to 50%, more preferably 25 to 45%, even more preferably 30 to 45%, as compared to a glass surface which has not been exposed.

Example 35: For one or more nonwoven materials of Examples 32-34, the nonwoven polymeric fibers comprise single row or multi-row meltblown polymer fibers.

Example 36: For the nonwoven material of Example 35, single row meltblown polymer fibers have an average diameter of 4 to 7 micrometers, preferably 5 to 7 micrometers, and multi-row meltblown polymer fibers have a mean diameter of 7 To 15 micrometers, preferably from 10 to 15 micrometers.

Example 37: In one or more of the nonwoven materials of Examples 32-36, the plurality of nonwoven fabrics are multi-row meltblown polymer fibers, and the nonwoven material is a nonwoven fabric that is determined by dropping 10 gram steel balls from a height of 10 centimeters An impact force of at least 70%, preferably from 70 to 95%, more preferably from 75 to 90%, as compared to a glass surface containing no material; And a reduction in impact of at least 30%, preferably 30 to 50%, more preferably 30 to 45%, as compared to a glass surface containing no nonwoven material, determined by dropping 30.6 grams of steel ball from a height of 20 centimeters Represents at least one.

Example 38: The nonwoven material of any one of embodiments 32-37, wherein the nonwoven material has a thickness of less than 150 micrometers, the plurality of nonwoven fibers are multi-row meltblown polymer fibers,

An impact force reduction of at least 80%, preferably 80 to 90%, as compared to a glass surface containing no nonwoven material, determined by dropping 10 gram steel balls from a height of 10 centimeters; And a reduction in impact of at least 40%, preferably 40 to 50%, as compared to the glass surface without the nonwoven material, determined by dropping 30.6 grams of steel ball from a height of 20 cm.

Example 39: An article comprising one or more of the nonwoven materials of Examples 32-38, wherein the article is foam tape, gasket, hand-held electronic back pad for the device.

In general, sub-assemblies, display devices, and methods may alternatively comprise, consist of, or essentially consist of any suitable components disclosed herein. Subassemblies, display devices, and methods may additionally or alternatively,

Materials, ingredients, adjuvants or species that are used in the prior art compounds or which are not necessarily required to achieve the object or function of the present invention. Or may be formulated so as not to include it substantially.

All ranges disclosed herein include endpoints, and the endpoints are independently combinable with one another. "Combinations" include blends, mixtures, alloys, reaction products, and the like. Quot; or "means" and / or ". The terms "first "," second ", and the like do not denote any order, amount, or importance, and are used to distinguish one element from another. &Quot; a "and" an " are to be construed to cover both the singular and the plural, unless otherwise indicated herein or otherwise contradicted by context. Reference in the specification to " another embodiment, "" an embodiment, " or the like, means that a particular element described in connection with the embodiment is included in at least one embodiment described herein, Or may not be present. "Optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and the description includes instances where events occur, And cases where the event does not occur. Unless defined otherwise, the technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this invention belongs. In addition, the described elements may be combined with any suitable method in various embodiments.

All cited patents, patent applications, and other references are hereby incorporated by reference in priority to U.S. Patent No. 62 / 200,887, filed August 4, 2015, and U.S. Patent No. 62 / 245,505, filed October 23, Including the call, are incorporated herein by reference in their entirety. However, where the terms of the present application contradict or conflict with the terms in the integrated reference, the terms of the present application take precedence over the conflicting terms of the integrated reference.

Although specific embodiments have been described, it will be appreciated by those skilled in the art that various alternatives, modifications, variations, improvements, and substantial equivalents, which are presently unexpected or unexpected, Lt; / RTI > and other conventional artisans. Accordingly, it is intended to embrace all such alternatives, modifications, variations, omissions, and substantial equivalents as may be claimed, such as the appended claims and modifications.

Claims (20)

A display component including an outer display surface and an opposite inner surface;
A compressible pressure pad disposed on the inner surface of the display component and including a plurality of nonwoven fibers having an average diameter of less than 100 micrometers; And
An internal component disposed on the compressible pressure pad on a side opposite the display component,
A subassembly for a display device.
The method according to claim 1,
Wherein the plurality of nonwoven fabrics comprise a thermoplastic polymer,
Preferably, the thermoplastic polymer is a thermoplastic polymer,
Polyacetals, polyacetals, poly (C1-6 alkyl) acrylates, polyamides, polyamideimides, polyanhydrides, polyarylates, polyarylate, polyarylate, polyarylene ether, polyarylene sulfide, polyarylsulfone, polybenzothiazole, polybenzoxazole, polybenzimidazole, and the like. ), Polycarbonate, polyester, polyetheretherketone, polyetherimide, polyetherketoneketone, polyetherketone, polyethersulfone, polyetherketone, polyetherketone, , Polyimide, poly (C1-6 alkyl) methacrylate, polymethacrylamide, polyolefin, polyoxa diazole, polyphthalide, polysilazane, polysiloxane, polystyrene, polysulfide, polysulfonamide, polysulfonate, polysulfone, polysulfone, polysulfone, polysulfone, polythioester, polytriazine, polyurea, polyurethane, polyvinyl alcohol, polyvinyl ester, polyvinyl ether (also referred to as " a polyvinyl ether, a polyvinyl ether, a polyvinyl halide, a polyvinyl nitrile, a polyvinyl ketone, a polyvinylidene fluoride, or the above-mentioned thermoplastic polymers. Combination
/ RTI >
3. The method of claim 2,
The thermoplastic polymer may contain,
The thermoplastic elastomer preferably comprises a hard segment comprising a polyester block and a soft segment comprising a polyether block, wherein the thermoplastic elastomer comprises a soft segment,
More preferably, the hard segment of the thermoplastic polyester elastomer comprises at least one of poly (alkylene terephthalate), poly (alkylene isophthalate), poly (alkylene isophthalate) ≪ / RTI >
Wherein the soft segment of the thermoplastic polyester elastomer comprises a polybutylene ether, a polypropylene ether, a polyethylene ether, or a combination comprising at least one of the foregoing, Polybutylene ether -;
Polyolefins, preferably polypropylene; or
Combinations comprising at least one of the foregoing
/ RTI >
The method according to claim 2 or 3,
The thermoplastic polymer
A tensile elongation at break of more than 100%, preferably more than 150%, more preferably more than 300%, measured according to ASTM D638;
A resiliency of more than 50%, preferably more than 60%, more preferably more than 65%, measured according to ASTM D4964;
A melt flow index which is effective to allow melt blowing of the thermoplastic polymer, measured according to ASTM D1238 or ISO 1133, preferably the thermoplastic polymer has a melt flow index < RTI ID = 0.0 >-;
≪ / RTI >
5. The method according to any one of claims 1 to 4,
Wherein the plurality of nonwoven fabrics comprise:
Further comprising a crosslinking agent,
Wherein at least a portion of the plurality of fibers is crosslinked at a point of contact between the fibers and preferably the crosslinking occurs during or after fabrication of the fibers
Subassembly.
6. The method according to any one of claims 1 to 5,
Wherein the compressible pressure pad comprises:
10 micrometers to 10 millimeters, or 50 micrometers to 5 millimeters, or 50 micrometers to 2 millimeters, or 50 micrometers to 1 millimeter, or 50 to 500 micrometers, or 50 to 250 micrometers; or
250 micrometers or less, or 10 micrometers to 200 micrometers, or 25 micrometers to 200 micrometers, or 50 to 200 micrometers
/ RTI >
7. The method according to any one of claims 1 to 6,
The plurality of fibers,
From 0.5 nanometers to less than 100 micrometers, or from 0.5 nanometers to 80 micrometers, or from 1 nanometer to 50 micrometers;
0.5 nanometers to 10 micrometers, or 10 nanometers to 8 micrometers, or 100 nanometers to 5 micrometers; or
250 nanometers to 5 microns, or 500 nanometers to 5 microns, or 750 nanometers to 5 microns, or 1 to 5 microns
Of the average diameter of the subassembly.
8. The method according to any one of claims 1 to 7,
Wherein the compressible pressure pad comprises:
From 0.05 nanometer to 50 millimeters, or from 0.1 nanometer to 1 millimeter, or from 1 nanometer to 500 micrometers
Wherein the subassembly has an average distance between fibers of the subassembly.
9. The method according to any one of claims 1 to 8,
Wherein the compressible pressure pad comprises:
Grams per 1 to 100 square meters, or grams per 2.5 to 50 square meters, or grams per 5 to 30 square meters
Of the subassembly.
10. The method according to any one of claims 1 to 9,
The compressible pressure pad is configured to < RTI ID = 0.0 >
Subassembly.
11. The method according to any one of claims 1 to 10,
A screen disposed on the outer surface of the display component and optionally an adhesive layer disposed between the screen and the display component,
≪ / RTI >
12. The method according to any one of claims 1 to 11,
A pressure-sensitive adhesive layer disposed on one or both sides of the compressible pressure pad,
≪ / RTI >
13. The method according to claim 11 or 12,
The adhesive layer may be an optically clear adhesive,
≪ / RTI >
14. The method according to any one of claims 1 to 13,
Wherein the display component is a liquid crystal display component or a light emitting diode display component, preferably an organic light emitting diode display component.
15. The method according to any one of claims 1 to 14,
The subassembly is a subassembly for a mobile electronic display device,
A light emitting diode display component or liquid crystal display component having an external display surface and an opposite internal surface,
A screen disposed on the external display surface of the display component;
A compressible pressure pad disposed adjacent the interior surface of the display component, the compressible pressure pad having an average diameter of less than or equal to 100 micrometers, a thickness of from about 50 micrometers to about 1 millimeter, A plurality of nonwoven fabrics, thermoplastic fibers, having a weight of grams devoid of foam; And
An internal component disposed on the compressible pressure pad of the opposite side of the display component,
/ RTI >
16. A method according to any one of claims 1 to 15,
. The display device is a mobile electronic device, preferably a cellular telephone, a smart telephone, a laptop computer, or a tablet computer,
A method for improving impact absorption or reducing ripple effects in a display device comprising display components disposed on an internal component, the method comprising:
Incorporating between the display component and the inner component a compressible pressure pad comprising a plurality of nonwoven fibers having an average diameter of less than 100 micrometers,
≪ / RTI >
A nonwoven material comprising a plurality of nonwoven polymeric fibers having an average diameter of less than 100 microns and a thickness of less than 250 microns,
Wherein the plurality of nonwoven polymeric fibers are < RTI ID =
A breaking elongation greater than 100% as measured in accordance with ASTM D638;
A resiliency of more than 50%, preferably more than 60%, more preferably more than 65%, measured according to ASTM D4964; And
A melt flow index greater than 5 grams per 10 minutes measured in accordance with ASTM D1238 or ISO 1133; And
Wherein the thermoplastic elastomer is a thermoplastic elastomer,
The nonwoven material disposed on a 1 mm thick glass surface,
At least 60%, preferably from 60 to 95%, more preferably from 65 to 90%, of the glass surface, which is determined by dropping a 10 gram steel ball from a height of 10 centimeters, Impact force reduction;
Preferably 20 to 50%, more preferably 25 to 45%, as compared to the glass surface that does not contain the nonwoven material, determined by dropping 30.6 grams of steel ball from a height of 20 centimeters
Impact force of at least 30%, preferably 30 to 50%, compared to the glass surface not comprising said nonwoven material, determined by dropping 55 gram steel balls from a height of 20 centimeters
(Exhibit)
Nonwoven material.
19. The method of claim 18,
Wherein the plurality of nonwoven polymeric fibers are < RTI ID =
And includes single row or multi-row meltblown polymer fibers,
Preferably, the single row meltblown polymer fibers have an average diameter of 4 to 7 micrometers, preferably 5 to 7 micrometers, and the multi-row meltblown polymer fibers have an average diameter of 7 to 15 micrometers, Having an average diameter of 10 to 15 micrometers
Nonwoven material.
20. The method according to claim 18 or 19,
Wherein the plurality of nonwoven fabrics are multi-row meltblown polymeric fibers, the non-
A reduction in impact of at least 70%, preferably 70 to 95%, more preferably 75 to 90%, as compared to the glass surface not containing the nonwoven material, determined by dropping 10 gram steel balls from a height of 10 centimeters ; And
A reduction in impact of at least 30%, preferably 30 to 50%, more preferably 30 to 45%, as compared to the glass surface which does not contain the nonwoven material, determined by dropping a steel ball of 30.6 grams from a height of 20 centimeters
Lt; RTI ID = 0.0 >
Nonwoven material.

Images